Y2038: add function __clock_nanosleep64

Linux does not provide a 64-bit-time clock_nanosleep syscall,
so __clock_nanosleep64 is a wrapper calling __clock_nanosleep,
with one conversion before the call and possibly one after.

Note:

There is no point in implementing __clock_nanosleep64 directly
around the 32-bit-time syscall and making __clock_nanosleep a
wrapper around __clock_nanosleep64, because __clock_nanosleep64
would still need one or two conversions, and __clock_nanosleep
would now also need those, adding a cost of 2 to 4 conversions
in the worst case.

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